The effect of the heat treatments on the antiferromagnetism in La2CuO4-δ single crystals

Yamada, Kazutoyo; Kudo, Eisuke; Endoh, Y.; Hidaka, Yoshimasa; Oda, Masahiro; Suzuki, Minoru; Murakami, Toshiaki

doi:10.1016/0038-1098(87)90693-4

Cited by 123 publications

(28 citation statements)

References 10 publications

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“…This result is consistent with that in oxygenated La 2 CuO 4 . 17,18 At a low temperature of ∼30 K, the magnetic Bragg intensities decrease in the x=0.014 and 0.018 samples and at the same time diagonal incommensurate peaks develop as in the pure spin-glass phase in La 2−x Sr x CuO 4 (0.02≤ x ≤0.055). As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Electronic phase separation in lightly dopedLa2−xSrxCu
Matsuda
¹
,
Fujita
²
,
Yamada
³

et al. 2002
Phys. Rev. B
Self Cite
173
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The hole concentration dependence of the magnetic correlations is studied in very lightly-doped La2−xSrxCuO4 (x <0.02), which shows coexistence of a three-dimensional antiferromagnetic (AF) long-range ordered phase and a spin-glass phase at low temperatures. It is found that the spin-glass phase in the coexistence region also shows a diagonal spin modulation as in the pure spin-glass phase in La2−xSrxCuO4 (0.02≤ x ≤0.055). Below x ∼0.02 the diagonal stripe structure is the same as that in x ∼0.02 with a volume fraction almost proportional to hole concentration, suggesting that electronic phase separation of the doped holes occurs so that some regions with hole concentration c h ∼0.02 and the rest with c h ∼0 are formed. This represents the most direct observation to-date of electronic phase separation in lightly-doped antiferromagnets. Such phase separation has been predicted by a number of theories.

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Section: Resultsmentioning

confidence: 99%

Electronic phase separation in lightly dopedLa2−xSrxCu
Matsuda
¹
,
Fujita
²
,
Yamada
³

et al. 2002
Phys. Rev. B
Self Cite
173
19
159
2
View full text Add to dashboard Cite

show abstract

“…It has been observed that m is correlated with the Néel temperature, T N , in both La 2 CuO 4 (Yamada et al, 1987) and YBa 2 Cu 3 O 6+y (Tranquada et al, 1988). In the earliest measurements of La 2 CuO 4 , samples typically contained excess oxygen, resulting in values of m and T N significantly lower than those of the stoichiometric material.…”

Section: Discussionmentioning

confidence: 99%

How to detect fluctuating stripes in the high-temperature superconductors

et al. 2003

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We discuss fluctuating order in a quantum disordered phase proximate to a quantum critical point, with particular emphasis on fluctuating stripe order. Optimal strategies for extracting information concerning such local order from experiments are derived with emphasis on neutron scattering and scanning tunneling microscopy. These ideas are tested by application to two model systemsthe exactly solvable one dimensional electron gas with an impurity, and a weakly-interacting 2D electron gas. We extensively review experiments on the cuprate high-temperature superconductors which can be analyzed using these strategies. We adduce evidence that stripe correlations are widespread in the cuprates. Finally, we compare and contrast the advantages of two limiting perspectives on the high-temperature superconductor: weak coupling, in which correlation effects are treated as a perturbation on an underlying metallic (although renormalized) Fermi liquid state, and strong coupling, in which the magnetism is associated with well defined localized spins, and stripes are viewed as a form of micro-phase separation. We present quantitative indicators that the latter view better accounts for the observed stripe phenomena in the cuprates.

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“…The ordered magnetic moment is also sensitive to impurity effects. In a study of single crystals with different annealing treatments, Yamada et al [65] found that the ordered moment is The magnetic coupling between layers in La 2 CuO 4 is quite weak because each Cu sees two up spins and two down spins at nearly the same distance in a neighboring layer. The small orthorhombic distortion of the lattice removes any true frustration, resulting in a small but finite coupling.…”

Section: Antiferromagnetic Ordermentioning

confidence: 99%

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Tranquada

Handbook of High-Temperature Superconductivity

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Summary. Neutron scattering studies have provided important information about the momentum and energy dependence of magnetic excitations in cuprate superconductors. Of particular interest are the recent indications of a universal magnetic excitation spectrum in hole-doped cuprates. That starting point provides motivation for reviewing the antiferromagnetic state of the parent insulators, and the destruction of the ordered state by hole doping. The nature of spin correlations in stripeordered phases is discussed, followed by a description of the doping and temperature dependence of magnetic correlations in superconducting cuprates. After describing the impact on the magnetic correlations of perturbations such as an applied magnetic field or impurity substitution, a brief summary of work on electron-doped cuprates is given. The chapter concludes with a summary of experimental trends and a discussion of theoretical perspectives. IntroductionNeutron scattering has played a major role in characterizing the nature and strength of antiferromagnetic interactions and correlations in the cuprates. Following Anderson's observation [1] that La 2 CuO 4 , the parent compound of the first high-temperature superconductor, should be a correlated insulator, with moments of neighboring Cu 2+ ions anti-aligned due to the superexchange interaction, antiferromagnetic order was discovered in a neutron diffraction study of a polycrystalline sample [2]. When single-crystal samples became available, inelastic studies of the spin waves determined the strength of the superexchange, J, as well as weaker interactions, such as the coupling between CuO 2 layers. The existence of strong antiferromagnetic spin correlations above the Néel temperature, T N , has been demonstrated and explained. Over time, the quality of such characterizations has improved considerably with gradual evolution in the size and quality of samples and in experimental techniques.Of course, what we are really interested in understanding are the optimallydoped cuprate superconductors. It took much longer to get a clear picture of the magnetic excitations in these compounds, which should not be surprising

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The effect of the heat treatments on the antiferromagnetism in La2CuO4-δ single crystals

Cited by 123 publications

References 10 publications

Electronic phase separation in lightly dopedLa2−xSrxCu
Matsuda
¹
,
Fujita
²
,
Yamada
³

et al. 2002
Phys. Rev. B
Self Cite
173
19
159
2
View full text Add to dashboard Cite

Electronic phase separation in lightly dopedLa2−xSrxCu
Matsuda
¹
,
Fujita
²
,
Yamada
³

et al. 2002
Phys. Rev. B
Self Cite
173
19
159
2
View full text Add to dashboard Cite

How to detect fluctuating stripes in the high-temperature superconductors

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

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The effect of the heat treatments on the antiferromagnetism in La2CuO4-δ single crystals

Cited by 123 publications

References 10 publications

Electronic phase separation in lightly dopedLa2−xSrxCuMatsuda1, Fujita2, Yamada3 et al. 2002Phys. Rev. BSelf Cite173191592View full textAdd to dashboardCite

Electronic phase separation in lightly dopedLa2−xSrxCuMatsuda1, Fujita2, Yamada3 et al. 2002Phys. Rev. BSelf Cite173191592View full textAdd to dashboardCite

How to detect fluctuating stripes in the high-temperature superconductors

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Contact Info

Product

Resources

About

Electronic phase separation in lightly dopedLa2−xSrxCu
Matsuda
¹
,
Fujita
²
,
Yamada
³

et al. 2002
Phys. Rev. B
Self Cite
173
19
159
2
View full text Add to dashboard Cite

Electronic phase separation in lightly dopedLa2−xSrxCu
Matsuda
¹
,
Fujita
²
,
Yamada
³

et al. 2002
Phys. Rev. B
Self Cite
173
19
159
2
View full text Add to dashboard Cite